Lamp construction



Dec. 2 1926.

H. c. FOSTER LAMP CONSTRUCTION Filed Nov. 24 1925 INVENTOR. HEM?! 6' F05 rat,

A TTORNEYS Patented Dec. 28, 1926.

var

HARRY G. FOSTER, OF CON'NERSVILLE, INDIANA, ASSIGNOB TO INDIANA. LAMP COR- PORATION, OF CONIxTER-SVILLE, INDIANA, A CORPORATION.

\- LAMP CONSTRUCTION.

Application filed November 24, 1925.

This invention pertains to a head lamp structure, particularly that type employed in connection with automobiles and similar vehicles.

The feature of the invention resides in the door structure wherein the lens retaining door rim is secured in place by means of a single screw engaging a yielding spring mounted nut for clamping the door in position against the spring pressure exerted thereby.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

Fig. 1 is a central vertical section through the lamp structure. Fig. 2 is a rear eleva tion of a part thereof. Fig. 3 is a section taken on the line 33 of Fig. 1. Fig. 4 is a section taken on the line 44 of Fig. 1.

In the drawings there is shown a lamp structure embodying the casing 10, the refiector 11, lens 12 and door rim 13 and lamp 14. The casing 10 is provided with the usual bead 15. Extending through the flanged face 16 preferably at the top of the lamp, there is a stem 17 having a hook portion 13 on the inner end thereof in position to hold the compression spring 19 surrounding the stem intermediate the end thereof and the flange 16. The stem 17 terminates in a plate 20 having the slot 21 in which the hook 22 mounted on the door rim 13 may engage. Extending through the flange 16 of the casing on the side thereof diametrically opposed to the plate 20 there is provided a similar stem 22 extending through said flange and surrounded by the spring 23. The head of the stem 22 is bent over to provide an internally screw threaded nut 24 which will lie adjacent an opening in the door rim which is adapted to register therewith when the rim is hooked into the plate 20.

The position of the reflector 11 intermer diate the flange 16 of the casing and the lens 12 which is secured within the door rim is such that when the door rim is hooked into the plate 20 the lower side thereof will extend outwardly at an angle due to its fulcrum-like engagement with the reflector. The outwardly extending lower side of the door rim may then be forced inwardly against the reflector as a fulcrum point, conipressing the spring 19 so that the screw 25 may be screwed into the nut 24 and tight- Serial No. 71,102.

ened therein. This will bring into play the spring 23 at the lower end whereby, upon the door being closed and locked in place by the screw 25, the springs 19 and 23 will tend to draw the door rim inwardly and hold it under spring tension against the reflector 11 through themedium of the lens and packing.

The bulb 14 is mounted in the usual'bayonet slotted sleeve 30 secured to the forwardly projecting arm of a U-shaped threaded bar 31. Said bar is supported by the screw bolt 32 having a head 33 so that as said bolt is rotated from the exterior of the casing the lamp 14 will be moved axially of the re flector for focusing purposes. intermediate the head 33 and the rear surface of the casing there is provided a rearwardly bulged plate 34 against which the screw head bears, and against the inner surface of the casing there is a similarly bulged plate 35 held in place by the spring 36 intermediate said plate and the bar 31. The intermediate portion of the casing is slotted, and a similar slot 37 is formed therein immediately below the same. The plates 34 and 35 are each provided with ears 38 and 39 respectively overlapping the slot 37 through which the screw 40 extends for clamping said ears together. By means of this arrangement, upon the screw 40 being partially unscrewed so as to release the clamping engagement of I the ears 38 and 39, both plates 34 and 35 may be moved up or down carrying a bulb 14 therewith for adjusting the same in a vertical plane or transversely to the axis of the reflector. This is accomplished without affecting the screw 32 owing to the springlike effect ofthe bulging plates. On the other hand the adjustment of the bulb longitudinally of the axis of the reflector may be readily had without disturbing the position of said plates. Thus two independent adjustments of the bulb for adjusting the focal position thereof may be had through this means.

The invention claimed is:

1. A lamp structure comprising a casing, a reflector mounted in said casing, a door closure therefor, means for removably securing one side of said closure to said casing so as to engage the forward edge of said reflector and clamp it in position against said casing, a threaded nut, means for resiliently mounting said threaded nut within the outer periphery of said casing substantially diametrically opposed to said securing means, and a screw extending through said door closure so as to engage and screw in said nut resiliently securing said closure in closed position whereby said nut and its resilient mounting will be contained and housed within said casing and closure.

2. A lamp structure comprising a casing arefiector mounted in said casing, a door closure therefor, means for removably securing one side or said closure to said casing so as to engage the forward edge of said reflector and clamp it in position against said casing, a nut mounted on a stem slidahly extending through said casing, a spring mounted on said stem for resiliently opposing its outward movement therefrom, and a screw extending through said door closure so as to engage said nut for securing said closure in closed position under the spring tension exerted by said spring.

3. A lamp structure comprising a casing, a

reflector mounted invsaid casing, a door closure the et'or, said reflector being clamped between said closure and casing when in closed position, a projecting hook engaging plate slidably mounted in said casing, a spring mounted thereon interiorly of said casing for resiliently resisting the outward movement thereof a hook on said door closure adapted to engage in said plate, a nut mounted on a stem projecting through said casing on the other side thereof and slidably mounted therein, a spring mounted thereon for resiliently resisting the outward movement thereof, and a screw extending through said'door closure so as to engage said nut for securing said closure in closed position under the spring tension exerted by said springs.

In witness whereof, I have hereunto affixed my signature.

HARRY C. FOSTER. 

